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	Gravimeter - Wikipedia, the free encyclopedia
		A gravimeter is a device designed to measure the local gravitational field.
		Therefore, gravimeters are susceptible to vibration which causes small, oscillatory accelerations.
		Though the essential principle of design is the same as accelerometers, gravimeters are typically much more sensitive than accelerometers in order to measure very tiny changes within the earth's gravity of 1 g (see unit gee).
	en.wikipedia.org /wiki/Gravimeter (246 words)

	United States Patent Application: 0050027489
		The method of claim 1, wherein said first gravimeter measurement and said second gravimeter measurement are taken from a sample mass, and wherein said method further comprises applying a magnetic pulse to said sample mass for biasing said phase shift.
		The processor of claim 8, wherein said first gravimeter measurement and said second gravimeter measurement are taken from a sample mass, and wherein said module applies a magnetic pulse to said sample mass for biasing said phase shift.
		The storage media of claim 15, wherein said first gravimeter measurement and said second gravimeter measurement are taken from a sample mass, and wherein said instruction control said processor to apply a magnetic pulse to said sample mass for biasing said phase shift.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20050027489".PGNR.&OS=DN/20050027489&RS=DN/20050027489 (3971 words)

	gravimeter -- Encyclopædia Britannica
		During the 1930s, however, static gravimeters replaced pendulums for local measurements over small ranges of gravity.
		The gravity field of the Earth can be measured by timing the free fall of an object in a vacuum, by measuring the period of a pendulum, or in various other ways.
		Such an instrument typically consists of a weight attached to a spring that stretches or contracts corresponding to an increase or decrease in gravity.
	www.britannica.com /eb/article-9037790 (412 words)

	Absolute Gravity Case Study, Newlyn Tide Gauge
		The FG5 absolute gravimeter is the latest in a series of technical developments made over many years by the USA National Institute of Standards and Technology and the University of Colorado [Niebauer et al., 1995].
		The principal of the absolute gravimeter is straightforward in that it measures the acceleration of a mass in free fall in a vacuum.
		Since the absolute gravimeter produces typically 200 values of gravity per hour, it is common practice to measure gravity at a site by measuring for 1 day or even just for a few hours.
	www.soest.hawaii.edu /cgps_tg/casestudy/case4_files (1513 words)

	Gregory Hodowanec: Gravitational Wave Detector Circuits (Site not responding. Last check: 2007-10-18)
		Commercial gravimeters of this type are constructed so as to not only limit lateral movements due to winds, temperature variations, vibrations, etc., but also to provide for an electrical-type readout rather than a purely mechanical readout so that the variations could be electrically scored and/or displayed on some recorder unit.
		While good performance as gravimeters may be obtainable from properly constructed and operated mechanical-type devices, the sensitivity of such units to external effects such as local vibrations or other movements generally limits their use to the amateur scientists lab area unless proper safeguards are used.
		Gravimeter unit Circuit #910 is a good introduction to both the dynamic GW detection of rapid ‘violent’ events in the universe, and also to observe the long-term highly averaged effects of these events on the earth’s gravity, i.e., the g-factor.
	www.rexresearch.com /hodo9/hodo9.htm (12609 words)

	Uncharted Seas - Page 2 (Site not responding. Last check: 2007-10-18)
		Public information from around 1999 indicated that a next-generation gravimeter installed on a nuclear sub could at that time clearly "see" underwater terrain out to about thirty miles, and at close range had a resolution -- sharpness -- of under ten meters.
		One disadvantage of the gravimeter is that its algorithms are unable to track moving objects -- such as other nuclear submarines whose reactor compartments, with their massive shielding, thick containment-vessel walls, and super-dense uranium core(s), make for a substantial discontinuity in micro-scale gravity fields.
		Again one may conjecture that if San Francisco had had a gravimeter aboard, she'd have gotten ample warning of the uncharted seamount ahead of her, to maneuver to avoid it.
	www.military.com /NewContent/0,13190,Buff_012005-P2,00.html (722 words)

	METEOROLOGICAL INFLUENCE
		However, the spring gravimeters we use are strongly influenced by the Earth tides and the meteorological parameters.
		This drift usually presents for the LCR gravimeters an obvious correlation with temperature variations and a negative correlation with air humidity measurements, both with a large phase lag.
		Generally, the recordings of spring gravimeters present an annual oscillation of the drift which is correlated with the temperature and the relative humidity variations.
	www.astro.oma.be /ICET/bim/text/10403.html (2580 words)

	Gravimeter calibration can be done both in time and frequency domain by comparing the instrumental response on common ...
		Gravimeter calibration can be done both in time and frequency domain by comparing the instrumental response on common gravity
		Gravimeter calibration can be done either in time or in frequency domain by comparing the instrumental response of two sensors on common signals (e.g.
		In this case the strong and irregular drift of spring gravimeters is expected to introduce systematic calibration errors.
	www.astro.oma.be /ICET/bim/text/meurers2.htm (2313 words)

	Gravimeter
		The principal behind marine gravimeter operation is not very different from that of those used on land.
		Measurements are taken continuously as the ship sails, so gyroscope-stabilized platforms were developed to reduce the effect of spurious acceleration due to the boat's roll and pitch.
		The BODENSEEWERK KSS30 spring gravimeter and a LOCKHEED MARTIN BGM 5 with accelerometers are used.
	www.ifremer.fr /fleet/equipements_sc/eq/gravimetre.htm (118 words)

	Deep Sea Gravimeter (Site not responding. Last check: 2007-10-18)
		The principal part of the gravimeter is a mechanical oscillator with frequency of 15Hz, shown in Figure-1.
		This pendulum configuration is necessary to recover the vertical position of the gravimeter sensitive axis, when the Geostar_2 reaches its working position at the bottom of the Mediterranean Sea.
		The interface communication between the gravimeter and the DACS is also prepared and tested.
	iafosun.ifsi.rm.cnr.it /~iafolla/GEOSTAR/geostar.html (668 words)

	[No title]
		In airborne Lacost-Romberg gravimetry, the acceleration sensed by the gravimeter is the sum of gravity, vertical acceleration and Eötvös acceleration of the airplane.
		Besides, the accelerations sensed by the gravimeter, are not the same as the ones sensed by the airplane.
		The differential equation of motion of the beam mixes all the input and output parameters of the gravimeter.
	www.cnrm.meteo.fr /aei2005/resumes/colo39.html (237 words)

	Paradoxes Resolved, Origins Illuminated - Gravitational Engineering - A Basic Transceiver
		The only gravimeter I've witnessed in operation is in the basement of the Physics Department of Univ. of Maryland at College Park, although I've processed data from other gravimeters with sensitivities of a part in a billion of the local acceleration of gravity.
		However, when the gravimeter is turned on, it is senstitive to changes in gravitational acceleration from any source in any direction.
		If a gravimeter registers a human being's moving around the room, and if that information is traveling between him and the meter at FTL, we should be able to measure that speed.
	www.metaresearch.org /msgboard/topic.asp?TOPIC_ID=248&whichpage=1 (5851 words)

	Absolute gravimeter FG5 No 215 (Site not responding. Last check: 2007-10-18)
		Because the measurements are directly connected to the absolute standards of length and time which are kept at all international laboratories around the world, the calibrated value of gravity acceleration may be achieved without any change of acceleration in time.
		The absolute gravimeter FG5 No 215 is used for periodic measurements on the absolute gravity point Pecný and for the measurements on another absolute gravity points.
		The program of measurements of gravimeter is leaded by project of the Center for Earth Dynamics Research.
	pecny.asu.cas.cz /www/absgrave.html (928 words)

	Miniaturized Gravimeter May Greatly Improve Measurements
		The new riseandfall laser interferometric absolute gravimeter is capable of 100 repetitions per minute, with a measured noise floor of about 1 µGal/min.
		It is difficult to release a test mass smoothly into free fall, and so free-fall gravimeters, though simple in concept, offer substantial mechanical challenges in their construction.
		A drop-only gravimeter typically spends a relatively large amount of time gently lifting the test mass, letting it settle at the top, and then waiting for it to gain an acceptable initial velocity to begin measurements.
	www.agu.org /eos_elec/99144e.html (2659 words)

	Apollo 17 Summary
		As CapCom Robert Parker told the crew, the outcome of this particular skirmish was that "the gravimeter people have won today." The quick stop for an LRV sample was going to be replaced with a longer stop for a gravimeter measurement.
		The gravimeter stop would take longer because both astronauts would have to get off the Rover, and that time would have to be taken out of some later geology stop.
		At the Scarp gravimeter stop he'd seen spots of color on the ground which, after a moment's consideration, proved to be spots of sunlight reflected off the gold foil on the front of the Rover.
	www.solarviews.com /eng/apo17.htm (12590 words)

	GGP Papers
		It is possible to detect precession and nutations by using the superconducting gravimeter data: a future project for GGP, in: International Union of Geodesy and Geophysics; XXI general assembly; 21, p.
		Observations of Earth tides and Earth's free oscillations by a superconducting gravimeter at Syowa Station Antarctica Anonymous, in Proceedings of the NIPR Symposium on Antarctic Geosciences, Yokyo, 8, 268-269.
		Virtanen, H., 1994, The new gravity laboratory and superconducting gravimeter of Finnish Geodetic Institute, Proc.
	www.eas.slu.edu /GGP/ggppap.html (9388 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		Keeping the suspension clamped and the connection to the battery inside the case intact, remove the gravimeter, place it on the hemispherical support, turn on the light and level the instrument (exactly!).
		Carefully put the gravimeter back in the case, close the case up, and move to the next station..
		Each gravimeter manufactured is calibrated against a known (g change when it is manufactured or repaired, and each has a different set of multiplicative constants to use to adjust the relative gravity differences to milligals.
	www.es.ucsc.edu /~rcoe/eart110c/Lab6_text.doc (2040 words)

	Geology
		As a lab exercise, we will use the gravimeter to determine the height of a table using 0.0877 scale divisions/mgal for the gravimeter and 0.09406 mgals/ft for the gradient of gravity with elevation.
		If anything is tricky about reading the gravimeter, it is the vernier scale for the dial; here's an example of how to read the Worden's scale.
		Use 0.0877 scale divisions/mgal for the gravimeter and 0.09406 mgals/ft for the gradient of gravity with elevation.
	www.umt.edu /Geology/faculty/sheriff/495-Environmental_Geophysics/EnviroGeophysics.htm (2842 words)

	sg phase calibration
		This is useful if the user wants to measure he mechanical response of the gravimeter, which depends largely on the spring constant of the levitating magnetic support field; the eddy current damping from the normal conductors around the sphere; and from the He gas surrounding the sphere.
		The reaction of the gravimeter to the injected voltages is measured by digitizing the input voltages and the output voltages of e.g.
		The amplitude of the steps and sine waves should be about 5-6V peak to peak and must be zeroed in agreement with the gravimeter offset (higher voltage or another zero can be chosen, as long as the gravimeter does not reach its full scale).
	www.eas.slu.edu /GGP/phasecal.html (2729 words)

	The Internet Foundation - Gravity Notes - Superconducting Gravimeters
		Federal Agency for Cartography and Geodesy (BKG) - Earth Rotation - Superconducting Gravimeter Temporal variations of the gravity force are measured by a gravimeter.
		For the superconducting gravimeter a superconducting hollow sphere is suspended by a magnetic field produced by currents in superconducting coils.
		Owing to the missing resistance the currents in the coils are nearly constant, therefore this gravimeter has a long-term stability never reached before.
	www.theinternetfoundation.org /Gravity/SuperConductingGravimeters.htm (531 words)

	Traverse Gravimeter Experiment
		The geology team was just as strongly opposed to not being able to see what the crew was doing every minute at a station, or not being able to see some potentially interesting rock and directing the crew's attention to it.
		The gravimeter team was hard pressed to specify exactly what constituted an "unacceptable" vibration level.
		Glenn Mamon, "A Traverse Gravimeter for the Lunar Surface", MIT Draper Labs, Cambridge, MA, August 1971, in the JSC History Office.
	ares.jsc.nasa.gov /HumanExplore/Exploration/EXLibrary/docs/ApolloCat/Part1/TGE.htm (893 words)

	EDIT THIS
		The variation in the gravity field is recorded using a Lacoste-Romberg gravimeter of 0.01 microgal accuracy.
		The fourth group of variations show a cycle of 24 h and is represented by smooth cyclic changes as given in Figure 1 which represents the tidal variation on 24 October 1995 at Dhoraji.
		Both the graphs show a smooth variation due to short period features like tidal and the drift of the gravimeter over which a shorter period feature of 10-12 microgal (10^-8 cm/s^2) between 6:30 and 7:30 am is superimposed.
	science.nasa.gov /newhome/headlines/Eclipse_Mishra.html (914 words)

	Tidal measurements on Geodetic Observatory Pecný (Site not responding. Last check: 2007-10-18)
		Other, non-tidal changes of the gravity field, are due to changes of vector of rotation of the Earth and by moving of the mass inside the Earth's body (so-called secular changes) - see also absolute gravity point and absolute gravity measurements.
		The main gravimeter of tidal station Pecný is Askania Gs15 No 228 owned by Department of Advanced Geodesy, Faculty of Civil Engineering, Czech Technical University in Prague.
		Thus, the gravimeter is now connected to a digital device for the feedback.
	pecny.asu.cas.cz /www/tidmease.html (865 words)

	gravimeter Manufacturer - gravimeter china Manufacturer, Supplier, Factory, Exporter
		China gravimeter Co., Ltd. is a share- holding cooperative venture, specializing in developing and manufacturing gravimeter products.
		Our gravimeter products are subcontract products for gravimeter and so on.
		China gravimeter Co., Ltd will insist on "doing better everydat to develop the market" to welcome domestic and overseas customers with our high quality and first-class service.
	gravimeter.50webs.com (413 words)

	Geodynamics: Absolute Gravimeter (Site not responding. Last check: 2007-10-18)
		An absolute gravimeter measures gravity by timing the free fall of a test mass in an evacuated chamber (upper yellow cylinder).
		The air pressure in the cylinder has been reduced to one billionth of an atmosphere to reduce air drag on the mass.
		This is an FG5 absolute gravimeter manufactured by Micro-g Solutions Inc., Erie, Colorado.
	www.pgc.nrcan.gc.ca /geodyn/abs_fig.htm (94 words)

	Remote sensing - Wikipedia, the free encyclopedia
		It is the utilization at a distance (as from aircraft, spacecraft, satellite, or ship) of any device for gathering information about the environment.
		The technique can make use of devices such as a camera, laser, radar, sonar, seismograph or a gravimeter.
		Modern remote sensing normally includes digital processes but can as well be done with non-digital methods.
	en.wikipedia.org /wiki/Remote_sensing (960 words)

	Lacoste & Romberg Gravimeter Instructions (Site not responding. Last check: 2007-10-18)
		Gravimeter requires two hours to reach operating temperature.
		To take a reading, place gravimeter on its circular plate and level using the fl leveling knobs.
		Top plate and controls of the Lacoste and Romberg model G gravimeter.
	www.seismo.unr.edu /ftp/pub/louie/class/field/lacoste.html (206 words)

	Juergen Neumeyer1)*, Piet Fourie2), Olaf Dierks, Hartmut Pflug
		The installed Superconducting Gravimeter (SG) and the environmental sensors are continuously recording data since February 2000 (Neumeyer et al.
		The calibration factor is determined by the amplitude ratio obtained from Absolute Gravimeter and SG measurements at these frequencies.
		As the final calibration coefficient the mean between the parallel registrations of theAbsolute Gravimeters FG5 (3), JILAg5 (4) and the SG is used.
	www.hartrao.ac.za /geodesy/JENA_200_files/JENA_200.htm (2469 words)

	[No title]
		In June of 1998 three flight tests were undertaken which tested a LCR gravimeter and a strapdown INS gravity system side-by-side.
		Airborne gravimetry, gravimeter, strapdown inertial navigation system (SINS) 1 Introduction The use of a LaCoste and Romberg S-model marine gravimeter for airborne gravity surveys has been well documented in the past seven years, see for example Brozena (1992), Forsberg and Kenyon (1994), Brozena et al.
		The modified LCR air/sea gravimeter is a highly damped spring gravity sensor mounted on a two-axes stabilized platform.
	www.sztaki.hu /conferences/iag2001/TypInstr-Sample.doc (623 words)

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